A massage motion device and a massager for scratching head, and the massage motion device includes a mounting seat and a pair of swing arm assemblies； the swing arm assemblies being mounted to the mounting seat, the swing arm assemblies includes a rotating wheel and a swing arm mechanism (400), the swing arm mechanisms (400) include a swinging arm (410), and a connecting member (420) rotatably connected to the swinging arm (410) via a second rotational shaft (620), the connecting arm (420) is provided with a slot (4211) matched with the second rotational shaft (620), the slot (4211) is disposed in a direction parallel to the axis of the second rotational shaft (620), and the length extending direction of the slot (4211) is disposed in parallel to the extending direction of the guide pin (422). On the basis of realizing the imitating and scratching action of the human hand, and since the length extending direction of the slot (4211) is parallel to the extending direction of the guide pin (422), preventing the whole connecting member (420) from affecting form the force parallel to the extending direction of the guide pin (422), thereby preventing the situation the connecting member (420) from jumping in parallel with the extending direction of the guide pin (422), and enhance stability.
